ISC Ohms fine and working. Throttle body?

[gsxAWDdsm692]

Search and search and search and follow everyones "directions" but they all FAIL.

I read somewhere that there is a special way to change the isc on '95's. Something to do with the timing light terminals or something like that. I'm tired of buying isc's every few months. Someone help this problem out.

 

[gsxAWDdsm692]

So today I measured the ohms on my "bad" sensor and the brand new one. They ohms are fine. I also did the ignition trick when the sensor is out and they both moved. I am thinking that my throttle body is messed up and is making me get the isc code. what do you guys think?

 

[gsxAWDdsm692]

Sensor was fine, problem lied with my throttle body which made me throw a isc code and made my idle ####ed up.

What happens if you adjust your idle with the BISS screw without putting the car in diagnostic mode?

 

[Drifte]

I cant help you but I am also interested in hearing the answer.

 

[tbonitz301]

Your isc will try to keep your idle where it was when it was set in diagnostic mode

 

[Artago]

How do you put the car in diagnostic mode? Anyone have a link to a write up?

Thanks,

Tom

 

[gsxAWDdsm692]

You have to ground something on the firewall, I can't find mine. All the write ups for this are on like lasers and shit.

 

[gsxAWDdsm692]

Here's a link but of course its 1G:

http://www.vfaq.com/mods/BISS-1G.html

BISS

It's called the ignition timing adjustment plug. Mines not in the area shown in the pictures of course. Anybody know where they are on 2g's?

And the diagnostic plug under the dash isn't there on 2g's. Anybody know where it is on 2g's or is it just the data link connector?

 

[gsxAWDdsm692]

Ouhhh I think I found mine today. It's brown. Can I just ground that and use a actron scanner as a ground on the Data Link Connector?

 

[Artago]

^^ Can you post pics? I need to set my ISC too but I don't know the procedure.

 

[gsxAWDdsm692]

^^ Can you post pics? I need to set my ISC too but I don't know the procedure.

I got you. Hold up a bit I'm in class.

 

[gsxAWDdsm692]

Basically you have to find this thing on the firewall.

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My car is a '95. I've noticed that the casing might be black on different cars. I know that 2ga's have some different colors then 2gb when it comes to some parts. Mine was brown.

Then you pop it open:

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And there will be a metal pin inside. You gotta get a pair of alligator clips and ground them to this pin.

Then you are supposed to ground the data link connecter, the thing you use for checking your check engine lights. Find the ground pin on there and ground that too.

Ground both of them and then get the car to normal operating temperature with the steering wheels straight and no accessory electronics on then start the car and turn the BISS screw to your desired idle speed. Take everything off and let the car idle for 5-10 minutes and it will stay at the set idle if you did it correctly.

Heres some pics of where I located my timing adjustment plug:

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[Crazyjoker77]

Have you tried this yourself and had success? Is this to change your idle from the factory 850+/-50 rpm to whatever you desire(ie a steady 1000rpms without the ISC trying to adjust it back to 850) or is this just to get the ISC to go hands off so you can correctly adjust the biss to get it at 850 without blowing up your isc?

I only ask because i remeber reading on here that a mitsubishi dealer scan tool is required on the 2nd generation dsms to put them into diagnostic mode.

also would you know if the pocketlogger cable grounds out that connection on the DTC connector or do i gotta dig up some wires?

 

[gsxAWDdsm692]

Have you tried this yourself and had success? Is this to change your idle from the factory 850+/-50 rpm to whatever you desire(ie a steady 1000rpms without the ISC trying to adjust it back to 850) or is this just to get the ISC to go hands off so you can correctly adjust the biss to get it at 850 without blowing up your isc?

I only ask because i remeber reading on here that a mitsubishi dealer scan tool is required on the 2nd generation dsms to put them into diagnostic mode.

also would you know if the pocketlogger cable grounds out that connection on the DTC connector or do i gotta dig up some wires?

I put a new throttle body in and the guy had the idle adjusted different. I am just trying to set it back to like 800-900 the proper way. And yea I guess if you don't do it this way it will eventually blow up your sensor.

I think that if you use any kind of electronic that goes into the DLC it grounds it, but I might be wrong. Not one of the 88k members has responded...

 

[Crazyjoker77]

well i found out that we have the online mitsu factory service manuals at work and dug into this a little deeper...

I've come to the conclusion that the 95s are different than the rest of the 2gs. And a mistu scan tool is required to properly adjust the idle

Im gonna copy and paste the procedures on here just for future reference of the many other dsmer that are gonna read this post and are confused on their ISC problems.


BASE IDLE ADJUSTMENT FOR 95 Eclipse/Talon Turbo

1. The vehicle should be prepared as follows before the inspection and adjustment.

o Engine coolant temperature: 80 - 95°C (176-203°F)
o Lights, cooling fan and accessories: OFF
o Transaxle: Neutral (P range for A/T)

2. Connect the scan tool to the data link connector (16-pin) NOTE: When the scan tool is connected, the diagnostic test mode control terminal should be grounded.

3. When not using the scan tool, proceed as follows:

a. Insert a paper clip into the 1-pin connector (blue).
b. Connect a primary-Voltage-detection type of tachometer to the paper clip.
c.Use the special tool (diagnostic trouble code check harness) to ground the diagnostic test mode control terminal (terminal 1) of the data link connector (16 pin).

4. Remove the waterproof female connector from the ignition timing adjustment connector.
5. Use a jumper wire to ground the ignition timing adjustment terminal.
6. Start the engine and run at idle.
7. Check the idle speed. Standard value: 750 +/- 50 RPM

NOTES:

1. The engine speed may be 20 to 100 RPM. lower than indicated above for a new vehicle [driven approximately 500 km (300 mile) or less], but no adjustment is necessary.
2. If the engine stalls or the RPM is low even though the vehicle has been driven approximately 500 km (300 mile) or more, it is probable that deposits are adhered to the throttle valve, so clean it. Refer to Throttle Body Cleaning Procedure.




8. If not within the standard value range, turn the engine speed adjusting screw to make the necessary adjustment. NOTE: If the idling speed is higher than the standard value range even when the engine speed adjusting screw is fully closed, check whether or not there is any indication that the fixed SAS has been moved. If there is an indication that it has been moved, adjust the fixed SAS. If there are no indications that it has been moved, it is possible that there is leakage as a result of deterioration of the fast idle air valve (FIAV) , and, if so, the throttle body should be replaced.
9. Switch OFF the ignition switch.
10. Disconnect the jumper wire from the ignition timing adjustment terminal and return the connector to its original condition.
11. Start the engine again and let it run at idle speed for about 10 minutes; check to be sure that the idling condition is normal.

 

[Crazyjoker77]

BASE IDLE ADJUSTMENT FOR 96+ Turbo Eclipse Talon


NOTE

1. The standard idle speed has been adjusted, by the engine speed adjusting screw, by the manufacturer, and there should usually be no need for readjustment.
2. The adjustment, if made, should be made after first confirming that the spark plugs, the injectors, the idle air control servo, the compression pressure, etc., are all normal.

1. The vehicle should be prepared as follows before the inspection and adjustment.

o Engine coolant temperature: 80-95°C (176-203°F)
o Lights, cooling fan and accessories: OFF
o Transaxle: Neutral (A/T for P range)

2. Connect the scan tool to the data link connector (16-pin) NOTE: When the scan tool is connected, the diagnostic test mode control terminal should be grounded.
3. Start the engine and run at idle.
4. Select the item No.30 of the SCAN TOOL (MUT-II) Actuator test. NOTE: This holds the IAC motor at the basic step to adjust the basic idle speed.
5. Check the idle speed. Standard value: 750 ±50 rpm NOTE

1. The engine speed may be 20 to 100 rpm lower than indicated above for a new vehicle [driven approximately 500 km (300 mile) or less], but no adjustment is necessary.
2. If the engine stalls or the rpm is low even though the vehicle has been driven approximately 500 km (300 mile) or more, it is probable that deposits are adhered to the throttle valve, so clean it.



6. If not within the standard value range, turn the engine speed adjusting screw to make the necessary adjustment. NOTE: If the idling speed is higher than the standard value range even when the engine speed adjusting screw is fully closed, check whether or not there is any indication that the fixed SAS has been moved. If there is an indication that it has been moved, adjust the fixed SAS. If there are no indications that it has been moved, it is possible that there is leakage as a result of deterioration of the fast idle air valve (FIAV), and, if so, the throttle body should be replaced.
7. Press the scan tool clear key, and release the IAC motor from the Actuator test mode. NOTE: Unless the IAC motor is released, the Actuator test mode will continue 27 minutes.
8. Switch OFF the ignition switch.
9. Disconnect the scan tool.
10. Start the engine again and let it run at idle speed for about 10 minutes ; check to be sure that the idling condition is normal.

 

[mjigga99]

I've been messing with my BISS since I bought my car to stop idle bounce, maybe this partially explains the IAC cel code I have. I'll take this write-up to autozone asap, thanks for the intel CrazyJoker77...

 

[rich3389]

Any chance these pics can be fixed?

 

[gsxAWDdsm692]

Any chance these pics can be fixed?

Yea, I'll do it tonight when I get off of work. Sorry I moved my photos into albums.